You don't. You can use any text editor like notepad if you want
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PacoJun 1 '09 at 19:52

@Paco, my comment was in the context of the question's download link, where it says you need Visual Studio to use some of the features of ASP.Net MVC. I'm saying that those features require VS during development and not deployment. I'm not saying that there is no way to develop ASP.Net MVC sites without Visual Studio.
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KevinJun 2 '09 at 14:13